Thanks for responding. Yes the password is 100% correct, I type it in several times a day and I tried it on several devices as well. I’m not sure how the password could have changed in the process of changing the login email.
I sadly didn’t make a backup, big mistake I guess. It’s also not the first time I changed my login mail and I didn’t have problems then.
I am already in contact with support but so far the troubleshooting is unsuccessful.